Pump-driving gear.



S. P. EUBANK.

PUMP DRIVING GEAR.

APPLIOATION FILED Arma. 1912.

1,040,912, Patented Oct. 8, 1912.

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SAMUEL F. EUBANK, OF COLUMBIA, KENTUCKY, ASSIGNOR 0F ONE-THIRD TO W. R.LYON. 0F CAMPBELLSVILLE, KENTUCKY.

PUMP-DRIVING GEAR.

Specification of Letters Patent.

Patented Oct. 8, 1912.

"` Toiall whom it may concern:

.Be it known that I, SAMUEL F. EUBANK, a citizen of the United States,residing at Columbia, in the county of Adair and State of Kentucky, haveinvented new and useful Improvements in Pump-Driving Gear, of which thefollowing is a specification.

This invention relates to pump driving gear, the object -of theinvention being to provide driving gear of the class described of a verysimple character, which will work with the least possible friction, andgive a stroke to the pump rod.

Another object of the invention is to pro vide for renewing the workingparts of the pump gear, so that the same may be maintained in perfectworking order at all times, at a minimum expense.

With the above and other objects in view, the invention consists in theconstruction, combination and arrangement of parts, as will behereinafter more fully described, illustrated in the accompanyingdrawings, and pointed out in the claim hereunto appended. l

In the accompanying drawings: Figure 1 is a side elevation of the pumpgear. Fig. 2 is a detail plan view of the pump lever. Fig. 3 is a detailsection through one of the parallel bars, showing the bearing rollers.Fig. et is a detail view of the flanged rack. Fig. 5 is a detail crosssection through the bar carrying the fixed rack.

The pump gear contemplated in this invention embodies a base l, which isshaped to fit over the top of the well or pump casing. Extending upwardfrom said base are two parallel bars 2 and 3, both of which bear a fixedrelation to each other and to the base 1. The bar 2 is oset, as shown at4, where it is connected to the base, in order to bring the upperportion of said bar close to the center of the base, so as to form abearing for the pump rod hereinafter described. The other stationary bar3 is also oset, as shown at 5, to locate said bar at a sufficientdistance from the bar 2 to provide for the working of thepinion,hereinafter described.

Extending through a central opening in the base 1, which opening ispreferably protected by means of a bushing 6, is the pump rod 7 havingsecured to its outer face a rack 8 extending lengthwise thereof. Theupper portion of the pump rod 7 is preferably square or rectangular incross section, adapting the rear face thereof to bear againstanti-friction rollers 9 and 10 journaled on suitable shafts in apertures1l formed in said bar 2. This provides for the frictionlcss travel ofthe pump rod up and down.

To the inner face of the opposite bar 3, there is secured a pair ofracks 12, extending lengthwise of said bar, and provided at theirextremities with extensions or flanges 13 adapted to receive bolts 14,which will admit of the loosening of the rack 12, and the placing ofshims or liners 15 back of the racks, for the purpose of allowing forany wear between the racks and the pinions meshing therewith.

17 designates the pump lever which has its inner end forked, as shown at18, adapting it to straddle the bar 3. Mounted in the forked end of thelever is a gear wheel, embodying a large central toothed section ormember 19, and smaller twin members or pinions 20 located at oppositesides thereof and bearing a fixed relation thereto. This gear wheel isprovided with a plurality of bolt holes adapted to receive bolts 21 and22 adapted to be inserted through correspending holes 23 in the forkedarms of the lever, so as to rigidly connect the lever and gear wheel,any desired number of holes 23 being provided in the lever to enable thesame to be shifted with relation to the gear wheel, the object being tovary the length and leverage of the lever 17. One of the bolts 22 passesthrough the center of the pinion in which is arranged a relatively r0-tatable core, said core having acentral opening for the boltr22.

The rack S is provided at opposite sides with projecting longitudinalflanges 25, between which the teeth of the central member 19 work,thereby preventing any possibility of the gear wheel getting out of meshwith the rack on the pump rod. The upper ends of the parallel bars 2 and3 are connected and relatively supported by means of cross braces 26.

The stationary bar 3 is provided with a central longitudinal slot 27, onopposite sides of which the racks 12 are secured, the slot being adaptedto permit the marginal portion of the central gear wheel or member 19 towork between the racks 12.

From the foregoing description, taken in connection with theaccompanying drawings, it will be understood that as the pump lever 17is worked up and down, Jthe lg'ear wheel will move up and down on thefixed racks 12, and at the same time will mesh with the rack 8 on thepump rod and give a relative accelerated movement and throw to the pumprod, the fulcrum of the lever 17 being at the point of engagementbetween the teeth of the pinions and the teeth of the racks l2.Therefore, such ulcrum is continuously shifting upward to downward, andit is for this reason that an, accelera-ted movement is imparted to thepump rod. Its throw may be changed by shifting' the bolts 2l and 22,above referred to, where they pass through the lever and the pinion.

7What is claimed is:

Pump driving gear, embodying stationary bars, one of which is providedwith a longitudinal slot, stationary racks secured in .tiXed relation tothe slotted bar and arranged at opposite sides of the slot therein, apump rod, a rack fastened to the pump rod, a pump lever, and a gearwheel connected to said lever and having three toothed faces meshingwith said rac-ks, the central or larger member of the gear wheel workingin the slot in the stationary bar. i

ln testimony whereof I afiiX my signature in presence of two witnesses.

SAMUEL F. EUBANK.y lWitnesses z JNO. W. F. CONNER, W. R. SQUIRE.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents. Washington, D. C.

